Solar Impulse plane

Credit: AFP/Getty Images

The Swiss sun-powered aircraft Solar Impulse leaves its hangar on May 24, 2012 in Payerne on its first attempted intercontinental flight from Switzerland to Morocco. Solar Impulse, piloted by Andre Borschberg, is expected to land in Madrid for a stopover before heading to Morocco without using a drop of fuel. Bertrand Piccard will pilot the second leg on to Rabat, scheduled to leave Madrid on May 28 at the earliest. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/GettyImages)